From mboxrd@z Thu Jan 1 00:00:00 1970 From: keith.busch@intel.com (Keith Busch) Date: Thu, 3 Dec 2015 23:50:41 +0000 Subject: IRQ and CPU Affinity on new Kernels In-Reply-To: References: Message-ID: <20151203235041.GA3565@localhost.localdomain> On Thu, Dec 03, 2015@06:35:55PM -0500, Angelo Brito wrote: > Hello Gentlemen, > > We had some problems with a controller and some commands were missing > (timeouts and cancelling I/O). > > I noticed that some interruptions were handled by different CPUs, like > in this example: I doubt the interrupt affinity you're seeing could have anything to do with timeouts or missing commands. There is a small window of time when a disk is initially brought online, but before the affinity hints are provided. Because of that, even if you properly affinitize all irqs to use the driver's hint, you'll likely see a few irqs on non-optimal CPU.